Chloro-Organic Degradation by Nanosized Metallic Systems

纳米金属系统降解氯有机物

• 批准号: 7311930
• 负责人: Dibakar Bhattacharyya
• 金额: $ 22.63万
• 依托单位: UNIVERSITY OF KENTUCKY
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/7311930
• 关键词: chelating agents; chemical reaction; chlorination; detoxification; electrochemistry; environmental contamination; environmental protection; halobiphenyl /halotriphenyl compound; hydrogen peroxide; hydroxyl radical; nanotechnology; oxidation reduction reaction; trichloroethylene; waste treatment

Versatile technologies are required for the development of effective dechlorination techniques of hazardous organics utilizing both oxidative and reductive pathways. Chlorinated organics range from chloroethylenes (such as the degreasing solvent, trichloroethylene, TCE), chlorophenols, polychlorinated biphenyls (RGBs), etc. Many chlorinated organics are toxic even at low concentrations, and exert a cumulative, deleterious effect on the environment. The overall objective of this proposal is to develop iron-based oxidative (with Fe(ll) chelates) and reductive (zero valent Fe with dopants such as, Ni, Pd) platforms suitable for highly effective remediation strategies for selected chloro-organic detoxification (PCB's and TCE). Our recent research work has shown the benefits of chelate-modified hydroxyl radical-based oxidative reaction and nanosized zero valent metals for reductive dechlorination. The fundamental understanding of these reactive systems is critical for sustainable use involving remediation. For the oxidative systems, the proposed research will examine in-situ generation of hydrogen peroxide by enzymes, immobilization of polychelates (such as poly-acrylic acid) on inert particles for controlled release of Fe(ll), which is needed for hydroxyl radical formation, and control of dechlorination rates. The reductive platform will examine synthesis of nanosized Fe/Ni and Fe/Pd bimetallic systems using chemical reductants (such as borohydride) and by a novel particle formation method using electrochemical technique within conducting polymers. The proposed research will require several studies involving development of materials, reagent immobilization techniques, quantification of surface morphology, parent compound and intermediates analysis for establishing reaction rates and carbon balance closure, and reaction kinetic parameters for remediation needs. Since hazardous waste and Superfund sites often contain mixture of organics the simultaneous development of both oxidative and reductive remediation techniques should provide more flexibility and tractable approaches.

使用氧化和还原途径的危险有机物的有效脱氯技术需要多功能技术。氯化有机物范围从氯乙烯（例如脱脂溶剂，三氯乙烯，TCE），氯苯酚，氯苯酚，多氯化双苯基（RGB）等。许多氯化有机物即使在低浓度下也是有毒的，并且对环境产生了累积的，累积的，有害的，有害的效应。该提案的总体目的是开发基于铁的氧化剂（具有Fe（LL）螯合物）和还原性（零VAT（零），诸如，Ni，PD等掺杂剂的零Valent Fe，适用于适用于精选的氯氯 - 有机排毒的高效修复策略（ PCB和TCE）。我们最近的研究工作表明，基于螯合物修饰的羟基自由基氧化反应和 纳米化的零价值金属用于还原脱氯。对这些反应性系统的基本理解对于涉及补救的可持续使用至关重要。对于氧化系统，拟议的研究将检查酶的原位过氧化氢，在惰性颗粒上固定聚螯合物（例如聚丙烯酸）以控制Fe（LL），这是羟基自由基形成所需的，并控制脱氯速率。还原平台将使用化学还原剂（例如硼氢化物）以及使用导电聚合物中的电化学技术来检查纳米化Fe/Ni和Fe/PD双金属系统的合成。提议 研究将需要几项研究，涉及材料开发，试剂固定技术，表面形态的定量，母体化合物和中间体分析，以建立反应速率和碳平衡闭合以及用于补救需求的反应动力学参数。由于危险废物和超级基金地点通常包含有机物的混合物，因此氧化和还原补救技术的同时发展应提供更多的灵活性和可拖动的方法。